Athscl autologous artery CABG w unstable angina pectoris

This code describes a specific type of coronary artery disease where an autologous (from the patient's own body) bypass graft, previously implanted to restore blood flow to the heart, has developed atherosclerosis. This graft disease is currently manifesting as unstable angina pectoris, indicating acute coronary syndrome.

Use this code when documentation clearly states atherosclerosis of an autologous coronary artery bypass graft and the patient is experiencing unstable angina. This typically occurs in patients with a history of coronary artery bypass grafting (CABG) who present with new or worsening anginal symptoms at rest or with minimal exertion, without evidence of myocardial necrosis.

• Ensure documentation specifies "autologous artery" graft to differentiate from other graft types (e.g., saphenous vein).
• Verify that the angina is explicitly documented as "unstable angina pectoris" to support the specificity of this code.
• Do not code with I20.0 (unstable angina without atherosclerosis of autologous artery coronary artery bypass graft(s)) due to the Excludes1 note.